def evp_decode(cipher_text, passphrase, salt=None):
cipher_text = base64.b64decode(cipher_text)
if not salt:
salt = cipher_text[8:16]
cipher_text = cipher_text[16:]
data = evpKDF(passphrase, salt)
decrypter = pyaes.Decrypter(
pyaes.AESModeOfOperationCBC(data['key'], data['iv']))
plain_text = decrypter.feed(cipher_text)
plain_text += decrypter.feed()
return plain_text
def gk_decrypt(name, key, cipher_link):
try:
key += (24 - len(key)) * '\0'
decrypter = pyaes.Decrypter(pyaes.AESModeOfOperationECB(key))
plain_text = decrypter.feed(cipher_link.decode('hex'))
plain_text += decrypter.feed()
plain_text = plain_text.split('\0', 1)[0]
except Exception as e:
logger.log(
'Exception (%s) during %s gk decrypt: cipher_link: %s' %
(e, name, cipher_link), log_utils.LOGWARNING)
plain_text = ''
return plain_text
def __decrypt(self, message, key, iv):
decrypter = pyaes.Decrypter(pyaes.AESModeOfOperationCBC(key, iv))
plain_text = decrypter.feed(message)
plain_text += decrypter.feed()
plain_text = plain_text.split('\0', 1)[0]
return plain_text